RTC problem about bootloder

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RTC problem about bootloder

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Contributor III

bootloder and the main program configuration is not the same RTC,or no configuration, resulting in boot into the main program internal RTC is not accuracy.RTC Run very fast

 

RTC config use extern 32.768KHZ

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello,

There might be a problem with the LPO Clock Select Register (LPOCLKS) which selects the source clock of the RTC module. The register is s a write-once register, and is reset only on POR or LVD. Please check whether you write more than once to the register.

Regards,

Daniel

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello,

There might be a problem with the LPO Clock Select Register (LPOCLKS) which selects the source clock of the RTC module. The register is s a write-once register, and is reset only on POR or LVD. Please check whether you write more than once to the register.

Regards,

Daniel

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Contributor III

thanks for your reply

Your answer is valid, due to LPOCLKS is write-once register,  main program can not config RTC again.

so, i search < S32K1XX MCU Family Reference Manual(REV 9).pdf>  about anyother write-once register, but i can not found, can you tell me  oher write-once register?

thank you !!!!!!!!!

 

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello,

We don't have any list of such registers.

Every register has its own specification in the RM.

Regards,

Daniel

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Contributor III
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